Dual Fuel Engine
Dual Fuel or DF Engines are the kind of engines which could work on a mixture of diesel fuel and gas fuel or it could operate on diesel fuel alone. Duel Fuel engines can not run on gas alone as they do not have an ignition system, nor do they have any spark plugs.

As diesel is not a pure gas, and it is not a pure diesel designed engine, it has some disadvantages in the department of fuel efficiency, as well as Methane slippage.. Like for instance, the fuel efficiency can be 5% to 8% less than in a comparable spark-ignited, lean burn engine at 100 percent load. It could even be greater on lower loads.

Lift Truck Classification and Fuel Sources
There are certain recycling materials handling applications that can prove very difficult for lift trucks. For example, scrap metal is among these issues. To be able to successfully handle things like this requires using the right type of equipment for the job.

There are 7 major lift truck classes, including power sources such as hydrogen fuel cell, liquid propane gas, electric, gasoline and diesel. The power source is linked to some of these particular classes. The main power sources for forklifts include Diesel, Gasoline, Battery, Fuel Cell and Propane.

Electric powered trucks are the most common, mainly Class I, II and class III forklifts. Internal combustion engines are more common in Classes V and IV. The most common electric power source is the lead-acid battery. Among internal combustion trucks, about over 90% are propane powered.

The battery is the forklifts most popular power source. Battery powered units make up about 60 percent of the new forklifts sold in the United States. Their benefits consist of: less maintenance requirements, quiet operation, the ability to be used outdoors and inside with no harmful emissions.